sheathed

adjectives

enclosed in a protective covering; sometimes used in combination
"his sheathed sword"; "the cat's sheathed claws"; "a ship's bottom sheathed in copper"; "copper-sheathed"
sheathed
antonym
unsheathed
is similar to
covered or protected with or as if with a case
"knights cased in steel"; "products encased in leatherette"
cased, encased, incased
is similar to
having an outer covering especially of thin metal
"steel-clad"; "armor-clad"
clad
is similar to
sheathed in iron plates for protection
ironclad
is similar to
resembling a pod
podlike